When the evidence makes out a prima facie case for the plaintiff against the railroad defendant for negligent injury to animals, the burden shifts to the defendant to show itself free from negligence which proximately caused the injury to the animals. Code of Ala., Title 48, Sec. 173; Louisville N. Railroad Co. v. Nettles, 45 Ala. App. 46, 222 So.2d 727; Louisville N. Railroad Co. v. Lewis, 44 Ala. App. 360, 208 So.2d 911; Id. 282 Ala. 727, 208 So.2d 913; Louisville N. Railroad Co. v. Morris, 44 Ala. App. 216, 205 So.2d 910; Id. 281 Ala. 722, 205 So.2d 915. An exception to the trial court's oral charge must recite what the court said or state the substance thereof definitely and must point out the particular part of the charge complained of, and an exception to a "portion" of the oral charge is not sufficient. Bentley v. Lawson, 280 Ala. 220, 191 So.2d 372; Ala. Power Co. v. Smith, 273 Ala. 509, 142 So.2d 228. The general affirmative charge should not be given if there is evidence reasonably affording an inference adverse to the right of recovery by the party asking the charge, or from which the jury might draw an inference adverse to such party. McMillan v. Aiken, 205 Ala. 35, 88 So. 135; Louisiana N. Railroad Co. v. Self, 45 Ala. App. 530, 233 So.2d 90; Louisville N. Railroad Co. v. Morris, 44 Ala. App. 216, 205 So.2d 910; Id.